Abstract
The effect of natural organic (O), sand (S) and clay (C) sediments, temperature (5, 15 and 25°C) and colloids on the transfer of 60Co, 65Zn, 134Cs and natural 238U from freshwater to sediments was investigated in the laboratory using lake sediment/water columns. Sediment type had a significant effect on the loss of these radionuclides from water. Loss of 60Co, 65Zn and 238U from water was generally in the order O > C > S sediment. Loss of 134Cs from water was in the order C > O > S sediment. Generally the loss of the radionuclides from water was greater at higher temperatures and was in the order 60Co > 65Zn > 134Cs > 238U. The presence of colloids slowed the loss of the radionuclides from water. Transfer rates of 0·014–0·077 d −1 for 60Co, 0·010–0·0.110 d −1 for 65Zn, 0·015–0·092 d −1 for 134Cs and 0·001–0·084 d −1 for 238U were measured depending on expirimental conditions and were in general agreement with the range of values reported from field studies.
Published Version
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